foo.diff

diff --git a/devtools/server/actors/replay/module.js b/devtools/server/actors/replay/module.js
index 67b5a6639d07..eb83b8dae475 100644
--- a/devtools/server/actors/replay/module.js
+++ b/devtools/server/actors/replay/module.js
@@ -358,6 +358,25 @@ function eventListener(info) {
     RecordReplayControl.onEvent(event, info.phase == "pre");
   }
 }
+function getWindowAsImageData(win) {
+  const canvas = win.document.createElementNS(
+    "http://www.w3.org/1999/xhtml",
+    "canvas"
+  );
+  const scale = getCurrentZoom(win);
+  const width = win.innerWidth;
+  const height = win.innerHeight;
+  canvas.width = width * scale;
+  canvas.height = height * scale;
+  canvas.mozOpaque = true;
+
+  const ctx = canvas.getContext("2d");
+
+  ctx.scale(scale, scale);
+  ctx.drawWindow(win, win.scrollX, win.scrollY, width, height, "#fff");
+
+  return ctx.getImageData(0, 0, canvas.width, canvas.height);
+}
 
 function SendRecordingFinished(recordingId) {
   const document = getWindow().document;
@@ -366,6 +385,8 @@ function SendRecordingFinished(recordingId) {
     url: document.URL,
     title: document.title,
     duration: new Date() - startTime,
+    lastScreenData: getWindowAsImageData(getWindow()),
+    lastScreenMimeType: "jpeg",
   };
   Services.cpmm.sendAsyncMessage("RecordingFinished", data);
 }